结构吸波材料多层阻抗渐变设计及应用

对多层阻抗渐变的吸波结构设计思想进行了分析,介绍了多层阻抗渐变思想在吸波层板和泡沫两类结构吸波材料设计上的应用。理论计算与试验验证结果均表明,采用多层阻抗渐变设计能够使吸波层板和泡沫的吸波带宽向低频拓展,同时显著提高吸波泡沫的吸收强度。具有三个阻抗渐变吸收层的4 mm厚吸波层板在5~18 GHz频段反射率小于-10 d B;具有六个阻抗渐变吸收层的22 mm厚吸波泡沫在2~18 GHz频段反射率小于-10 d B,其中在6~18 GHz频段反射率小于-20 d B,8~12 GHz频段反射率小于-30 d B。多层阻抗渐变设计是提高结构吸波材料吸波性能的有效手段。

Design and Application of Multilayer Graded Impedance inStructural Radar Absorbing Materials

The design theory of absorbing structure with multilayer graded impedance is summarized and its application

in design of absorbing laminate and foam is introduced in this paper. Both calculation and experiment show

that design of multilayer graded impedance can extend absorbing bandwidth of the laminate and foam to low frequency

and enhance absorbing efficiency of the foam. Reflectivity of the 4 mm thick laminate with three layers of graded impedance

is less than -10 dB between 5 GHz and 18 GHz. Reflectivity of the 22 mm thick foam with six layers of graded

impedance is less than -10 dB between 2 GHz and 18 GHz, is less than -20dB between 6 GHz and 18 GHz, and

is less than -30 dB between 8 GHz and 12 GHz. Design of multilayer graded impedance is an effective method for enhancing

the absorbing properties of structural radar absorbing materials.